Platform for stairways.



S. LIEBERMAN PLATFORM FOR STAIRWAYS.

APPLICATION FILED JAN. 20, 1911.

JPatenteflNov. 27, 191?.

Z SHEETS-SHEET I.

miri lm Lu 2 I! TTORIVEVS SIMON LInnnnMAn, or NEW YORK, N. Y.

PLATFORM FOB STAIRWAYS.

Specification of Letters Patent.

Patented Nov. 21%, 1W1

Application filed January 20, 1917. Serial No. 143,451.

To all whom it may concern:

Be it known that I, SI ON LIEBERMAN, a citizen of the United States, anda resident of the city of New York, borough of Manhattan, in the countyand State of New York, have invented a new and 1mproved Platform forStairways, of which the following is a full, clear, and exactdescription.

The invention relates to metallic building structures, and its object isto provide a new and improved platform for stairways arranged todispense with supportmg T-irons and sockets therefor, and to permit ofeconomically manufacturing and setting up the platform and at the sametime providing a trussed platform which is exceedingly strong anddurable.

In order to accomplish the desired result, use is made of a metalplatform provided with a plate of sheet steel or other sheet metal,

and having depending integral ribs formed by doubling up some of theplatforrnmaterial during the process of manufacturing the platformplate, the side members of the doubled-up ribs being spaced apart toprovide trusses for reinforcing the platform plate and to providepockets for the reception of some of the cementitious mater1al used as acovering for the platform.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification in whichsimilar characters of reference indicate cor responding parts in all theviews.

Figure 1 is a sectional side elevation of the platform as applied to astairway, the section being on the line 1-1 of Fig. 2;

Fig. 2 is a plan view of the same with the platform covering removed andthe stair string and the walls of the building shown in section;

Fig. 3 is a longitudinal section of the same on the line 33 of Fig. 2;

Fig. r is an enlarged longitudinal section of a portion of the platform;

Fig. 5 is a sectional perspective view of a portion of one of thesupporting bars of the supporting frame for the platform plate; and

Fig. 6 is a sectional perspective view of a portion of the platformplate.

In the manufacture of platforms for iron stairways, it has heretoforebeen customary to use a frame supporting a flat metallic plate along themargin thereof, the platform plate being supported intermediate its endsby transverse T-irons fitting at their ends into sockets, bolted,riveted or otherwise fastened to the side members of the supportingframe. This construction involved considerable expense, material, andlabor, and in my invention, presently described in detail, 1 entirelydispense with the T-irons and the sockets, and at the same time providea trussed platform which is exceedingly strong and durable.

The platform of the iron staircase, shown in Figs. 1, 2 and 3, consistsessentially of a platform plate 10 resting along its margin on asupporting frame formed of angle iron end bars 11 and 12, an angle ironrear bar 13 and a front channel bar 14. The supporting frame describedis attached to the stair string15 by theuse of rivets, bolts or similarfastening devices 16.

The platform plate 10 is preferably made of sheet steel or similar sheetmaterial and is provided with depending, transvers ly eX- tending ribs2-0 struck up from the sheet material by doubling portions thereof, theside members of each doubled portion being spaced apart, as plainlyshown in Figs. 3 and 1, to provide a strong reinforcing truss member andat the same time to provide a pocket which is open at the top. The topmember of the bar 13 of the supporting frame is provided with spacednotches into which extend the rear ends of the ribs 20, the front endsof which are cut off and a portion of each rib is slotted to fit the topmember of the bar 1 1 (see Figs. 1 and 6).

In assembling the parts for the platform the supporting frame is firstattached to the stair string 15 and then the platform plate 10 is placedin position on the supporting frame and fastened to the top membersthereof by suitable bolts 26 or other suitable fastening devices. Theplatform plate is then provided with a covering which may be in the formof a slate slab or in the form of a plastic cementitious material 30, aportion of which passes into the pockets formed by the ribs 20 so as toanchor the cementitious covering material in place on top of theplatform plate 10.

In case the covering of the platform is of a cementitious material 30 asabove described and illustrated in the drawings, then use is preferablymade of reinforcing rods each embedded in the material 30 con tained inthe corresponding pocket formed middle portion of by a wire 4:1 passeing around therod and resting with its ends on the upper surface of theplatform plate 10, as plainly shown in Figs. 2 and 4. It is understoodthat the rod 40 and its supporting wire are placed inposition prior toplacingthe cementitious material 30 in position and the said rod andWires are embedded subsequently in the cementitious material toreinforce the same and thus greatly strengthen the platform. i

. From the foregoing it will be seen that by the arrangement describedthe platform plate 10 is strongly reinforced by the use of the integralribs 20, and the platform parts can be readily and quickly assembledthus dispensing with a considerable amount of labor.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A platform for metallic Stairways, comrisin a SL1) ortin frame 'havinfront O b and rear supporting bars provided with top members havingspaced open ended slots,

and a platform plate made of sheet metal and 14 of the supand resting onthe said frame, the said platform plate being provided with integraltransversely extending vertical depending ribsfitting at their ends intothe 'said slots, concrete reinforcing elements held in the channels ofsaid ribs, and fastening-means fastening the platform plate at itsmargin to the said supporting frame.

2. A platform for metallic stairways having a cementitious covering,comprising a supporting frame having front and rear supporting barsprovided With top members having spaced open'ended slots, and'a platformplate made of sheet'm etal and resting on the saidframe, the saidplatform plate being provided with j integral transversely extendingdepending ribs fitting at their ends into the said slots, the said ribsformed of doubled portions ofthe material of the plate, the side membersof the doubled portions spaced apart to form channels open at the top ofthe plate, reinforcing rods sus pended Within said channels, andotherreinforcing elements suspending said rodsand supportedon the upper faceof the plate 1 at each side of the channels, and fastening meanssecuring theplatformplate at its 7 mar in to the said su ortin frame. gy g p e V SIMON. LIEBERMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

